Reinforced glass and its manufacture.



E. BENEDICTUS.

REINFORCED GLASS AND ITS MANUFACTURE.

APPLICATION FILED AUG. 9, 1910.

L 1 %,@%m Patentd Feb. 9, 1915.

IN VENTUR EDWARD .EENEDICTMS the interposition'and stickingbetween themj tion allows the result to be obtained only by crimes.

EDO'UAJBD BEN' DICTUS. 0F PARIS,

ianrnroncnn enass arm rrs MANUFACTURE.

icense.

To all whom it may concern:

Be it known that l, EDOUARD,BENEDIC:I'U B, of 25 Rue Fourcroy, Paris, France, artistic painter, have inventedjc'ertain new and useful Improvements in Reinforced Glass andits Manufacture, of which the following is a full, clear, and exact description. 4

In the specification of my. patent appl cation Serial Number 537557 filed January 11th 1910, I have described a strengthenedglass composed of sheets of glass united by of a sheet of celluloid previously coated with a suitable solvent.

Practice has shown that in order to obtain a product havingthe requisite quantities from a three-fold point of view of perfect and permanent transpa rehce, resistance to shocks and to perforation, and lastly,in case of breakage--of adherence of the fragmentsof glass to the celluloid it is indispensable first to soften sufliciently under-the action of the solvent the faces of the sheet of celluloid to enable it to mold itself upon the glass and, secondly, to expel the solvent completely after it has produced its effect. The pressure, mentioned in that previous specificameans of very delicate and expensive'ma- It is necessary to employ a hydraulic press and to attain considerable pressures in order to expel the solvent and from this arises the nece ssity of having a material of high price, a costly working and. liability to wastage because of the breakage of the glass subjected to, pressure, it special precautions be not taken. The expelllng of the solvent cannot, moreover, be realized in a thoroughly complete manner if the celluloid hasbeen imbued with an excess of solvent; further this latter cannot be recovered in a practical manner. Lastly, the process by pressure is inapplicable to the 'sticking'of curved, arched or convex glass.

The improvement which forms the subject of the present invention, consists in substituting for pressure the action of a vacuum for the purpose of expelling the solvent to the last traces and permitting the recovery of the solvent.

In the accompanying drawing 1 have illustrated in vertical. section two sheets of glass b-b reinforced by the interposition of a sheet of celluloid a, in accbrdance with my process.

By way of example, ll may in practice specification Letters Patent.

a suitable solvent.

Patented were. a, was.

" Application filed August 9, 1910. Serial No. 576,356.

carry, out the new'process by means of a vacuum in the following mannert In a receiver filled with volatile solvent (acetone,

amyl acetate, &c.) I dip in succession in such a waythat they are superposed in the proper order the sheets of glass and the sheet of celluloid. After an immersion for some seconds, I remove the whole together, I allow it to drain or drip and place. itin a closed chamber where a vacuumis formed by any suitable means. and confined air, if any, have been expelled After the excess solvent" and while the faces of the celluloid are still I pasty from the action of the solvent, air is again admitted to the receiver. and theatmospheric pressure exerted against the exposed faces of the sheets presses the latter together firmly and insures a perfect joint. It is not necessary to carry-the 'rarefactio'n to an absolute vacuum; experiments show that a, vacuum of 150millimeters of mercury may-be suiiicient. The higher the vacuum is carried the more rapid is the operation; it may be further accelerated by the action of heat. It is preferred to act suddenly by the vacuum. The vapors of the solvent which have been liberated under the action of the vacuum may be drawn off into a reservoir wherein they are recovered by condensation.

In place of celluloid I may employ viscose. or other products having a celluloid base, or, again, casein, gelatin and in general any product capable of being put into the form of transparent or translucent sheets, non-brittle but able to be softened by In case of viscose and gelatin, for instance, this solvent is simply hot water.

Having thus described my invention, what I claim as such and desire to secure by Letters Patent is l. A method of making reinforced glass,

which consists in softening the surface of a sheet of binding niaterial by means of avolatile solvent, sandwiching such sheet between sheets of glass, subjecting the thus juxla posed sheets to a vacuum to remove exsolvent, and then subjecting the sheets to atmospheric pressure while the surface of the binding material is still pasty under the influence of the solvent whereby the sheets are firmly pressed together, substantially as, described.

2. A method of making reinforced glass, which consists in softenin the surface of sheet of binding materia by means of a volatile solvent, sandwiching such sheet between sheets of glass, subjecting the thus juxtaposed sheets to a vacuum in the presence of heat to remove excess solvent, and then subjecting the sheets to atmospheric pressure While the surface of the binding material is still pasty under the influence of the solvent, whereby the sheets are firmly pressed together, substantially as described.

3. A method of making reinforced glass, which consists in softening the surface of a sheet of celluloid by means of a volatile solvent, sandwichin such sheet between sheets of glass, Sub ecting the thus juxtaposed sheets to a vacuum to remove excess solvent, and then subjectin the sheets to atmospheric pressure while t e surface of the binding material is still pasty under the in- I name to this specification, in the presence of two subscribing witnesses.

EDOUARD BENEDICTUS.

Witnesses CHARLES DONY,

H. C. Con. 

